Does anyone have NuTiny-SDK-N76E003-V2.1 Virtual COM working correctly ?

Testing the NuTiny-SDK-N76E003-V2.1, it seems the Virtual COM port has bugs.

I can connect to COM5 using any terminal, but when I run N76E003- UART test code that sends 0x55 continually, characters are lost.
Less than a dozen bytes appear per Port Open.
ie it does open, and some handful of chars appear, but then it fails - no more chars until next open ?
Scope shows the N76E003- UART is burst sending continually, as expected. ie the Nu-Link-Me or Driver, is failing.

Dear Sir,
Would you mind check with Nu-Link-Me V3.0 side SW3 switch, it connect on the on / off status?
as default this connect to off, means VCOM function is disable. please connect to the on side and confirm with COM port number to confirm it actually connect with for this tiny board.

Dear Sir,
Would you mind check with Nu-Link-Me V3.0 side SW3 switch, it connect on the on / off status?
as default this connect to off, means VCOM function is disable. please connect to the on side and confirm with COM port number to confirm it actually connect with for this tiny board.

Yes, SW3 is all = ON.
If SW3 = OFF, there is no COM port showing in Device Manager.
The Nuvoton virtual COM port (COM5) does connect, but nothing appears on either of the pins labeled TX, RX and the P1.2 LED I have set to toggle on RX, has no change.

Connection of an external USB-UART bridge, has the P1.2 LED toggle as expected, so N76E003 is correctly programmed.

Appears there is some issue with the COM port firmware, or driver.
Can you give details of the test setup Nuvoton use to confirm Nuvoton virtual COM port actually does work ?
eg Has Nuvoton tested loop-back OK, on Win10.64b Driver ?

Trying now, strange, the earlier one I used has the same name, but different size zip ??
Nu-Link_USB_Driver_V1.2.exe.zip = 14,513k, the link above was only Nu-Link_USB_Driver_V1.2.exe.zip = 14,216k and fails to unzip, (looks corrupted?) so I try 2nd download, but that is slow....

2nd time it is 14,513k, and says updated, but exactly the same issues.
Port shows as being open, but no bytes come out when using the BATCH file. Bytes do come out when using the NuvoISP.exe
Looks like there is a bug in the driver, that requires something the ISP code does, that BATCH and Terminal Software, does not do.
This should work, and is easy to test :